How to run/display this .java file, and with what?

Hi

I have downloaded the attached file, and am trying to run it, have downloaded eclipse, jre development kit, and it will not run, stating it misses a main class? Is the file incomplete?

So my question is = can anyone assist me with running this application?

//Title:        A Simple Drawing Tool
//Version:      1.0
//Copyright:    Copyright (c) 2001
//Author:       Yasir Feroze Minhas
//Company:      KAPS Computing (pvt) Ltd.
//Description:  This is a simple tool written using AWT for drawing basic shapes.

package graph;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SimpleDrawingTool extends Frame{

  //constants for menu shortcuts
  private static final int kControlA = 65;
  private static final int kControlD = 68;
  private static final int kControlC = 67;
  private static final int kControlR = 82;
  private static final int kControlP = 80;
  private static final int kControlT = 84;
  private static final int kControlX = 88;

  private RectangleShape rectangle = new RectangleShape();
  private OvalShape oval = new OvalShape();
  private PolygonShape polygon = new PolygonShape();
  private TriangleShape triangle = new TriangleShape();

  private DrawingPanel panel;

  public SimpleDrawingTool() {
    //set frame's title
    super("Simple Drawing Tool");
    //add menu
    addMenu();
    //add drawing panel
    addPanel();
    //add window listener
    this.addWindowListener(new WindowHandler());
    //set frame size
    this.setSize(400, 400);
    //make this frame visible
    this.setVisible(true);
  }

  public static void main(String[] args) {
    SimpleDrawingTool simpleDrawingTool = new SimpleDrawingTool();
  }
  /**
  This method creates menu bar and menu items and then attach the menu bar
  with the frame of this drawing tool.
  */
  private void addMenu()
  {
    //Add menu bar to our frame
    MenuBar menuBar = new MenuBar();
    Menu file = new Menu("File");
    Menu shape = new Menu("Shapes");
    Menu about = new Menu("About");
    //now add menu items to these Menu objects
    file.add(new MenuItem("Exit", new MenuShortcut(kControlX))).addActionListener(new WindowHandler());

    shape.add(new MenuItem("Rectangle", new MenuShortcut(kControlR))).addActionListener(new WindowHandler());
    shape.add(new MenuItem("Circle", new MenuShortcut(kControlC))).addActionListener(new WindowHandler());
    shape.add(new MenuItem("Triangle", new MenuShortcut(kControlT))).addActionListener(new WindowHandler());
    shape.add(new MenuItem("Polygon", new MenuShortcut(kControlP))).addActionListener(new WindowHandler());
    shape.add(new MenuItem("Draw Polygon", new MenuShortcut(kControlD))).addActionListener(new WindowHandler());

    about.add(new MenuItem("About", new MenuShortcut(kControlA))).addActionListener(new WindowHandler());
    //add menus to menubar
    menuBar.add(file);
    menuBar.add(shape);
    menuBar.add(about);
    //menuBar.setVisible(true);
    if(null == this.getMenuBar())
    {
      this.setMenuBar(menuBar);
    }
  }//addMenu()

  /**
  This method adds a panel to SimpleDrawingTool for drawing shapes.
  */
  private void addPanel()
  {
    panel = new DrawingPanel();
    //get size of SimpleDrawingTool frame
    Dimension d = this.getSize();
    //get insets of frame
    Insets ins = this.insets();
    //exclude insets from the size of the panel
    d.height = d.height - ins.top - ins.bottom;
    d.width = d.width - ins.left - ins.right;
    panel.setSize(d);
    panel.setLocation(ins.left, ins.top);
    panel.setBackground(Color.white);
    //add mouse listener. Panel itself will be handling mouse events
    panel.addMouseListener(panel);
    this.add(panel);
  }//end of addPanel();

  //Inner class to handle events
  private class WindowHandler extends WindowAdapter implements ActionListener
  {
    public void windowClosing(WindowEvent e)
    {
      System.exit(0);
    }

    public void actionPerformed(ActionEvent e)
    {
      //check to see if the action command is equal to exit
      if(e.getActionCommand().equalsIgnoreCase("exit"))
      {
        System.exit(0);
      }
      else if(e.getActionCommand().equalsIgnoreCase("Rectangle"))
      {
        Menu menu = getMenuBar().getMenu(1);
        for(int i = 0;i < menu.getItemCount();menu.getItem(i).setEnabled(true),i++);
        getMenuBar().getShortcutMenuItem(new MenuShortcut(kControlR)).setEnabled(false);
        panel.drawShape(rectangle);

      }
      else if(e.getActionCommand().equalsIgnoreCase("Circle"))
      {
        Menu menu = getMenuBar().getMenu(1);
        for(int i = 0;i < menu.getItemCount();menu.getItem(i).setEnabled(true),i++);
        getMenuBar().getShortcutMenuItem(new MenuShortcut(kControlC)).setEnabled(false);
        panel.drawShape(oval);
      }
      else if(e.getActionCommand().equalsIgnoreCase("Triangle"))
      {
        Menu menu = getMenuBar().getMenu(1);
        for(int i = 0;i < menu.getItemCount();menu.getItem(i).setEnabled(true),i++);
        getMenuBar().getShortcutMenuItem(new MenuShortcut(kControlT)).setEnabled(false);
        panel.drawShape(triangle);
      }
      else if(e.getActionCommand().equalsIgnoreCase("Polygon"))
      {
        Menu menu = getMenuBar().getMenu(1);
        for(int i = 0;i < menu.getItemCount();menu.getItem(i).setEnabled(true),i++);
        getMenuBar().getShortcutMenuItem(new MenuShortcut(kControlP)).setEnabled(false);
        panel.drawShape(polygon);
      }
      else if(e.getActionCommand().equalsIgnoreCase("Draw Polygon"))
      {
        Menu menu = getMenuBar().getMenu(1);
        for(int i = 0;i < menu.getItemCount();menu.getItem(i).setEnabled(true),i++);
        getMenuBar().getShortcutMenuItem(new MenuShortcut(kControlP)).setEnabled(false);
        panel.repaint();
      }
      else if(e.getActionCommand().equalsIgnoreCase("About"))
      {
        JOptionPane.showMessageDialog(null, "This small freeware program is written by Yasir Feroze Minhas.", "About", JOptionPane.PLAIN_MESSAGE);
      }
    }//actionPerformed()

  }//windowHandler - Inner Class ends here
}//SimpleDrawingTool

class DrawingPanel extends Panel implements MouseListener
{

  private Point sPoint = null;
  private Point ePoint = null;
  private Shapes shape = null;
  private java.util.ArrayList list = new java.util.ArrayList();
  //override panel paint method to draw shapes
  public void paint(Graphics g)
  {
    g.setColor(Color.green);
    shape.draw(list, g);
  }
  public void drawShape(Shapes shape)
  {
    this.shape = shape;
  }
  //define mouse handler
  public void mouseClicked(MouseEvent e)
  {
    //if user wants to draw triangle, call repaint after 3 clicks
    if(shape instanceof TriangleShape)
    {
      list.add(e.getPoint());
      if(list.size() > 2)
      {
        repaint();
      }
    }
    else if(shape instanceof PolygonShape)
    {
      list.add(e.getPoint());
    }
  }//mouseClicked
  public void mouseEntered(MouseEvent e){}
  public void mouseExited(MouseEvent e){}
  public void mousePressed(MouseEvent e)
  {
    sPoint = e.getPoint();
  }//mousePressed
  public void mouseReleased(MouseEvent e)
  {
    ePoint = e.getPoint();
    if(ePoint.getX() < sPoint.getX())
    {
      Point temp = ePoint;
      ePoint = sPoint;
      sPoint = temp;
    }
    if(ePoint.getY() < sPoint.getY())
    {
      int temp = (int)ePoint.getY();
      ePoint.y = (int)sPoint.getY();
      sPoint.y = temp;
    }
    if(shape instanceof RectangleShape || shape instanceof OvalShape)
    {
      list.clear();
      list.add(sPoint);
      list.add(ePoint);
      repaint();
    }
  }//mouseReleased
}//DrawingPanel

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